PROBLEM TO BE SOLVED: To prevent the screwing of a male connector from being released from a female connector by mistake.SOLUTION: A connector (1) for medical infusion lines, transfusion lines or the like includes a tubular body (2) having at one end a male connector (8) including an inner tubular element (9) and an outer hollow element (10), the male connector being able to be inserted inside the female connector and coupled thereto by screwing. The line connector (1) further includes an outer manoeuvering sleeve (22) which is coupled to the body (2) by being rotated in the direction in which the male connector is screwed with respect to the female connector (8), and rotatable in the opposite direction, and formed with two parts (23, 24) to be coupled to the body (2).【課題】雌型コネクタから雄型コネクタが誤って螺合を解除されることを防止する。【解決手段】医用点滴ライン、輸液ライン等のためのコネクタ(1)は、内方管状要素(9)及び外方中空要素(10)からなる雄型コネクタ(8)を一端に有する管状本体(2)を備え、前記雄型コネクタは、雌型コネクタの内方に挿通され、螺合により連結可能である。ラインコネクタ(1)は、さらに、雌型コネクタ(8)に対して雄型コネクタを螺合する方向に回転されて本体(2)に連結され、反対方向に回転自在であり、本体(2)に連結される2つの部位(23、24)を形成された外方操作スリーブ(22)を備える。【選択図】図1